Limited obstetric ultrasound examinations.
D002983:Clinical Competence / Q000592:standards; D003194:Computer-Assisted Instruction / Q000191:economics; D003365:Costs and Cost Analysis; D004509:Education, Nursing, Continuing / Q000191:economics*; D006801:Humans; D020407:Internet / Q000191:economics; D024802:Nurse's Role; D016216:Ultrasonography, Prenatal / Q000451:nursing*